They could simply remove the wet effect and let the rain drops and the sound.I don’t mind.
They should make it like the pieces that have 100% shelter should not be getting the wet texture…
But I’m not a dev they said it was impossible to do with the Unreal 4 Engine 
They said somthing similar about the mounts, and here we go.
Well, not so much “impossible” but rather labor intensive for such a small change in the game.
Tons of work vs. little reward
Agreed
Hire a better roofer… That is one thing I disliked about rain. Otherwise, I love having weather effects.